I think it DOES get better, the more running you do- but a temporary "fix" is to run an initial loop so that you can drop back into the house, or other convenient loo, if there's one nearby, then continue the rest of your run in comfort.
Yup- seen the change of plan- all good, then- am just tring to visualise the new course - looks like we start off right up the stppe bit of the hill, and get the flattish road section as the middle- wonder if that mkes for a faster time?
So- is GO33 going to happen? It will be very wet underfoot, even if the rain stops now! - The forecast for the day itself still looks OK, - light rain, fairly light winds, although there is to be heavy rain right up until the early hours of the morning- could be interesting!
What RicF says...............you seem to have some natural talent- but in order to take advantage of it, you would need to train a LOT to be up at the top end in most races. There's no point doing that if it is not what you want.
You don't say how old you are - why not just run for enjoyment now, and you can always come back to it on a more serious basis later in life.